Route handlers (GET, POST, PUT, DELETE) in NestJS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of a GET route handler in NestJS?

A GET route handler is used to retrieve data from the server. It responds to client requests by sending back information without changing any data on the server.

beginner

How do you define a POST route handler in NestJS?

You use the @Post() decorator above a method inside a controller. This method handles requests that send data to the server, usually to create new resources.

intermediate

What is the difference between PUT and POST route handlers?

POST creates new resources, while PUT updates existing resources. PUT is idempotent, meaning calling it multiple times has the same effect as once, unlike POST.

beginner

How do you handle DELETE requests in NestJS?

You use the @Delete() decorator on a controller method. This method deletes a resource on the server when the client sends a DELETE request.

intermediate

Why is it important to use the correct HTTP method in route handlers?

Using the correct HTTP method helps the server and client understand the action being performed, keeps APIs clear, and supports proper caching and security.

Which decorator is used to create a route handler for retrieving data in NestJS?

A @Get()

B @Post()

C @Put()

D @Delete()

The @Get() decorator defines a route handler that responds to GET requests, which are used to retrieve data.

What HTTP method should you use to update an existing resource?

A GET

B POST

C PUT

D DELETE

PUT is used to update existing resources on the server.

Which route handler decorator would you use to delete a resource?

A @Get()

B @Post()

C @Put()

D @Delete()

The @Delete() decorator handles DELETE requests to remove resources.

What is the main use of the POST route handler?

A Retrieve data

B Create new data

C Update data

D Delete data

POST is used to send data to the server to create new resources.

Which HTTP method is idempotent, meaning multiple identical requests have the same effect as one?

A PUT

B GET

C POST

D DELETE

PUT is idempotent; calling it multiple times does not change the result beyond the initial update.

Explain how to create route handlers for GET, POST, PUT, and DELETE requests in NestJS.

Think about the HTTP methods and their purpose in REST APIs.

Why is it important to match the HTTP method with the correct route handler in NestJS?

Consider how HTTP methods describe the action intended.